Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1975-03-03
1977-06-07
Stearman, Joel
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1602
Patent
active
D02446022
REFERENCES:
patent: D195911 (1963-08-01), Bravo
patent: D216565 (1970-02-01), Holderied
patent: 3712713 (1973-01-01), Appledorn
3M Overhead Projectors Catalog, Dec., 1968, front cover, projector.
Mango Joseph R.
Wolfe Donald G.
Alexander Cruzan
Minnesota Mining and Manufacturing Company
Rademaker C. A.
Stearman Joel
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